That "god" thing is often misunderstood. If we assume that humans are somehow connected, by quantum entanglement in their brains or whatever, then mushrooms make this connectedness apparent by muting the link to the body motor complex. In other words, that "god" is the union of all humans, and currently it's undergoing, for its own reasons, a severe form of schizophrenia when its big consciousness is split into a few billions small consciousnesses.